1 year ago

15 points!!

Mathematics

2 answers:

Katarina [22]1 year ago

8 0

Answer:

C. 394.2 ft²

Explanation:

surface area of triangular prism: (a+ b + c) × length + base × height

Here given:

a = 9 ft

b = 9 ft

c = 9 ft

base = 9 ft

length = 12 ft

height = 7.8 ft

Applying the formula:

(9+ 9 + 9) × 12 + 9 × 7.8

394.2 ft²

saveliy_v [14]1 year ago

6 0

Answer:

Step-by-step explanation:

9x7.8x1/2x12

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